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11 abdominal segments is a rule for Fanniidae. I don't know any exceptions to this rule.
Both Platypezidae and Fanniidae as far as I know... have lateral processes. Both have flatten dorsoventral body.

To me this seems to be a Fannia sp.

The fourth and fifth images show us the cephalo-pharyngeal skeleton. (in last we can see but in frontal view but not so good at the others.)